107 lines
3.5 KiB
Groff
107 lines
3.5 KiB
Groff
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.\" $NetBSD: arithmetic.6,v 1.12 2009/03/11 13:00:37 joerg Exp $
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.\"
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.\" Copyright (c) 1989, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Eamonn McManus of Trinity College Dublin.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)arithmetic.6 8.1 (Berkeley) 5/31/93
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.\"
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.Dd May 31, 1993
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.Dt ARITHMETIC 6
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.Os
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.Sh NAME
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.Nm arithmetic
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.Nd quiz on simple arithmetic
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.Sh SYNOPSIS
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.Nm
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.Op Fl o Ar +\-x/
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.Op Fl r Ar range
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.Sh DESCRIPTION
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.Nm
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asks you to solve problems in simple arithmetic.
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Each question must be answered correctly before going on to the next.
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After every 20 problems, it prints the score so far and the time taken.
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You can quit at any time by typing the interrupt or end-of-file character.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl o
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By default,
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.Nm
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asks questions on addition of numbers from 0 to 10, and corresponding
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subtraction.
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By supplying one or more of the characters
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.Ar +\-x/ ,
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you can ask for problems in addition, subtraction, multiplication, and
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division, respectively.
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If you give one of these characters more than once, that kind of problem
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will be asked correspondingly more often.
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.It Fl r
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If a
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.Ar range
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is supplied,
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.Nm
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selects the numbers in its problems in the following way.
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For addition and multiplication, the numbers to be added or multiplied
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are between 0 and
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.Ar range ,
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inclusive.
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For subtraction and division, both the required result and the number to
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divide by or subtract will be between 0 and
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.Ar range .
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(Of course,
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.Nm
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will not ask you to divide by 0.)
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The default
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.Ar range
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is 10.
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.El
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.Pp
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When you get a problem wrong,
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.Nm
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will remember the numbers involved, and will tend to select those numbers
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more often than others, in problems of the same sort.
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Eventually it will forgive and forget.
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.Pp
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.Nm
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cannot be persuaded to tell you the right answer.
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You must work it out for yourself.
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.Sh DIAGNOSTICS
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.Dq What?
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if you get a question wrong.
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.Dq Right!
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if you get it right.
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.Dq Please type a number.
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if
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.Nm
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doesn't understand what you typed.
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.Sh SEE ALSO
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.Xr bc 1 ,
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.Xr dc 1
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